This post is the second of a pair to mark the period of the 25th Conference of Parties to the UN Framework Convention on Climate Change, and is contributed by Andrea Deri, Cataloguer.
In addition to seafarers, fishers in the Mediterranean Sea applied oil as Pliny the Elder and Plutarch described. Divers released olive oil from their mouth and used the oil film on the sea surface as a ‘skylight’ for underwater fishing. Oyster collectors in Gibraltar did just the same. They made use of their observation that oil prevented ripples formation and the smooth surface allowed steadier and deeper penetration of sunlight for increased visibility under the water.
This is a metadata only record.